#define  _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
	int n = 0;
	char arr[14] = { 0 };

	scanf("%d", &n);
	int i = 0;
	int k = 0;

	while (n)
	{
		if (k != 0 && k % 3 == 0)
		{
			arr[i++] = ',';
		}
		arr[i++] = n % 10 + '0';
		n = n / 10;
		k++;
	}
	for (i--; i >= 0; i--)
	{
		printf("%c", arr[i]);
	}

	return 0;
}


